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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a612ef1b2d59ac5af8c35a5f3f1d96167e4399b557c7cd4b5576ebd153b0badd' 
  AND token = '1pvUv7LJ/BA+o7Toyl6Fiunzcy0zbwuo7WfxrOfRNEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}